Definition of bad girl in English:

bad girl

Pronunciation /ˈbad ɡəːl/

noun

informal US
  • A woman who defies expected or approved standards of conduct, especially one who behaves in a wild, rebellious, or sexually provocative manner.

Origin

Mid 19th century; earliest use found in Daily Express & Herald (Dubuque, Iowa). From bad + girl, with (humorous) allusion to the noun phrase bad girl in the general sense ‘ill-behaved female child’.